JP3084910U - Tape deck brake drive and tape deck provided with the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a brake drive device of a tape deck,
By suppressing the deflection of the resin spring for applying pressing force to the brake shoe that brakes the capstan, maintaining the braking force applied to the capstan properly, and removing the slack of the tape, the generation of noise in the reproduced image is reduced. Suppress. A cam wheel that has a boss 65 on an arm body 63 side of a capstan braking arm 6 and a boss 61 on a tip end 64a of a resin spring 64 extending from the arm body 63 to control switching of an operation mode of a tape deck. 3 is provided with a cam groove 34 that engages with the boss 61 and a cam wall 35 that contacts the boss 65. In the tape unloading state,
While the boss 61 is locked by the cam groove 34, the boss 65
Is guided in the outer peripheral direction of the cam wheel 3 by the cam wall portion 37, and the deflection of the resin spring 64 is corrected by this guidance.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a brake driving device for braking the rotation of a capstan during slow reproduction of a tape deck and a tape deck provided with the same.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, in a tape deck such as a VCR (video cassette recorder), there is known a brake driving device that applies a brake to a reel base in a recording pause (pause) mode (for example, Japanese Patent Laid-Open No. 63-113846). reference). In addition, when a tape is drawn from a tape cassette and travels along a head cylinder, a drive mechanism that stabilizes the travel of the tape by appropriately controlling the operation of a guide post that guides the tape is known (for example, a driving mechanism is known). And JP-A-7-21624).

In the tape deck, when shifting from the playback mode to the slow playback mode, the running speed of the slow-running tape does not match the rotation speed of the capstan. May occur. Therefore, in order to remove such slack in the tape, the control unit (microcomputer) of the tape deck outputs an instruction to reduce the rotation speed to the motor that drives the capstan, so that the tape drive speed is reduced. There are tape decks that try to match the rotation speed of the stan. However, even in such a tape deck, the above instruction is output from the microcomputer, and a delay of several milliseconds occurs until the rotation speed of the capstan actually decreases, so that the slack of the tape can be avoided. Noise is generated in the reproduced image. In view of the above, there is a tape deck provided with a brake driving device that mechanically brakes the rotation of the capstan by sliding a brake shoe on the flywheel of the capstan in the slow reproduction mode.

[0004] The brake driving device will be described with reference to FIGS. FIG. 5 shows the brake drive device as viewed from the back of the chassis. The brake driving device 100 includes a worm 2 for driving a cam wheel 103, a cam wheel 103 for switching an operation mode of a tape deck, and a capstan brake arm 106 for applying a brake to a flywheel 10 of a capstan. I have.

FIG. 6 shows the cam wheel 103. The cam wheel 103 includes a worm wheel 32 that receives drive from the worm 2 and a cam groove 34 that engages with the boss 61 formed on the capstan braking arm 106 and swings the capstan braking arm 106. , And are integrally formed by resin molding. The cam groove 34 is provided with a large-diameter portion 34a for guiding the boss 61 to the outer peripheral side of the cam wheel 103 in a section corresponding to the slow reproduction mode.

The capstan brake arm 106 is rotatably supported by a shaft 67 at a predetermined position on the rear surface of the chassis S. FIG. 7A shows the capstan braking arm 106. The capstan braking arm 106 includes an arm body 63, a brake shoe 62 for braking the capstan by sliding on the flywheel 10 of the capstan, a resin spring 64 extended from the arm body 63, A boss 61 is provided at the tip end 64 a of the head 64.

[0007] The brake driving device 100 shown in FIG. 5 shows a state in which braking is applied to the capstan in the slow regeneration mode. That is, when the boss 61 is guided to the outer peripheral side of the cam wheel 103 when reaching the outer diameter portion 34a from the cam groove 34, the capstan braking arm 106 swings in the C direction, and the brake shoe 62 rotates. It comes into contact with the rotating flywheel 10. The boss 61 is further guided in the outer circumferential direction of the cam wheel 103 and applies a pressing force to the brake shoe 62 with the flywheel 10 while bending the resin spring 64. As a result, the brake shoe 62 slides on the flywheel 10 with an appropriate pressing force, and mechanically brakes the capstan.

[0008]

However, by repeating such slow regeneration, a force in the same direction (a force in the outer circumferential direction of the cam wheel 103) is repeatedly input to the resin spring 64. As a result, "set" may occur in the resin spring 64. FIG. 7B shows a state in which the resin spring 64 is permanently deformed due to the above “set” by a dotted line. As described above, when the resin spring 64 is permanently deformed, when the brake shoe 62 slides on the flywheel 10 in the slow regeneration mode, a sufficient pressing force cannot be obtained between the brake shoe 62 and the flywheel 10 and the capping force is not obtained. It is not possible to apply proper braking to the stan.

[0009] Of course, the design of the resin spring 64 is made so as not to cause such “sagging”. However, in a high-temperature environment, the resin spring 64 remains in the operation state of the slow regeneration mode shown in FIG. When various conditions such as a case where the resin spring 64 is left for a long time are assumed, it is difficult to avoid the above-described permanent deformation only by the design of the resin spring 64.

Further, the boss 61 of the brake driving device 100 during the tape unloading is in a state of being lightly engaged with the cam groove 34. Therefore, if a shock such as dropping or vibration is applied during transport of the tape deck, the relative positional relationship between the boss 61 and the cam groove 34 changes suddenly, the two are disengaged, and the slow reproduction function does not work. There is a fear.

The present invention has been made in order to solve the above-mentioned problems, and a resin spring for applying a pressing force to a brake shoe even under unfavorable conditions such as leaving in a slow reproduction state in a high temperature environment. Suppresses flexure and maintains the braking force applied to the capstan properly, thereby suppressing the generation of noise in the reproduced image and a robust brake that does not lose the slow reproduction function due to dropping or vibration during transportation. It is an object of the present invention to provide a tape deck having a driving device.

[0012]

[Means for Solving the Problems]

 In order to achieve the above object, the invention of claim 1 is to provide a rotating body that is driven to rotate when the operation mode of the tape deck is switched and a capstan that slides in conjunction with the rotation of the rotating body. A capstan braking arm made of a resin molding material having a sliding portion for moving and braking the rotation of the capstan. A cam groove for swinging the capstan braking arm is provided on the rotating body. The stun brake arm is provided with a resin spring extending from an arm body having a sliding portion, and further provided with a first protrusion engaged with a cam groove at a distal end side of the resin spring. The first protrusion is guided by the cam groove with the rotation of the rotating body, and at least in the slow regeneration mode, drives the capstan braking arm to swing in the outer circumferential direction of the rotating body. Cap while bending In a tape drive brake drive device that brakes the rotation of the tongue, a second projection is provided on the arm body of the capstan braking arm, and the rotating body comes into contact with the second projection. A cam wall is provided, and in a tape unloading state, the second protrusion contacts the cam wall while the first protrusion is locked in the radial direction of the rotating body by the cam groove. Thus, the arm body of the capstan braking arm is guided in the outer peripheral direction of the rotating body, and the deflection of the resin spring is corrected by this guidance.

In this configuration, in the slow regeneration mode, the pressing force of the sliding portion against the capstan is optimized by the elastic force of the resin spring bent by the movement of the first projection, and the capstan is braked. Controlling. A cam wall is provided at a position corresponding to the second protrusion in the tape unloading state on the rotating body. In this state, the arm body of the capstan braking arm is moved in the outer circumferential direction of the rotating body. To guide. At this time, since the first protrusion remains engaged with the cam groove, it is locked in the radial direction of the rotating body. Therefore, when the tape deck is in the tape unloading state, the second protrusion comes into contact with the cam wall to move the arm body in the outer circumferential direction of the rotating body, that is, in the direction for correcting the bending of the resin spring. Energize. Thus, the deflection of the resin spring is corrected, the permanent deformation of the resin spring is suppressed, and the pressing force of the sliding portion against the capstan is properly maintained. In the same state, the arm body is urged in the outer circumferential direction of the rotating body in addition to the engagement between the first projection and the cam groove, so that the engagement between the first projection and the cam groove is strong. become. Therefore, there is no possibility that the boss and the cam groove may be disengaged even when the tape deck receives a shock such as dropping or vibration during transportation. The slow playback mode is a mode including a rewind slow playback mode in addition to the normal slow playback mode.

Further, the invention according to claim 2 is that the rotating body driven to rotate when the operation mode of the tape deck is switched and the capstan is slid on the capstan by swinging in conjunction with the rotation of the rotating body. A capstan brake member for braking the rotation of the capstan brake, wherein the rotating body is provided with a first cam for swingingly driving the capstan brake member, and the capstan brake member is provided with an elastic spring portion via an elastic spring portion. A first protrusion engaging with the first cam is provided, and the first protrusion is guided by the first cam as the rotating body rotates, and at least in the slow regeneration mode, the capstan brake is provided. In a tape deck brake driving device that swings and drives a member in a predetermined direction and thereby deforms a spring portion to brake the rotation of the capstan, a second protrusion is provided on the capstan braking member. Rare In addition, the rotating body is provided with a second cam which can be brought into contact with the second projection. At least in the tape unloading state, the first projection is moved by the first cam. The capstan braking member is guided to correct the deformation of the elastic spring portion by the second protrusion abutting on the second cam while being locked in the predetermined direction.

In this configuration, in the slow reproduction mode, the pressing force of the sliding portion against the capstan is adjusted by the elastic force of the elastic spring deformed by the movement of the first projection, and the braking of the capstan is performed. Controlling. A second cam is provided at a position corresponding to the second protrusion in the tape unloading state on the rotating body, and guides the capstan braking member in the outer peripheral direction of the rotating body in the same state. At this time, the first protrusion is locked because it remains engaged with the cam groove. Therefore, when the tape deck is in the tape unloading state, the second protrusion abuts on the second cam, thereby urging the capstan braking member in a direction for correcting the deformation of the elastic spring. Thus, the bending of the elastic spring is corrected, the permanent deformation of the elastic spring is suppressed, and the pressing force of the sliding portion against the capstan is properly maintained. Further, since the capstan braking member is urged in addition to the engagement between the first projection and the first cam, the above-mentioned engagement is strong. Therefore, there is no possibility that the boss and the cam groove may be disengaged even when receiving an impact such as dropping or vibration during transportation of the tape deck. The slow playback mode is a mode including a rewind slow playback mode in addition to the normal slow playback mode.

According to a third aspect of the present invention, in the tape drive brake driving device according to the second aspect, the capstan braking member and the elastic spring portion are integrally formed by resin molding. . With this configuration, a capstan braking member having an elastic spring can be easily manufactured.

According to a fourth aspect of the present invention, there is provided a tape deck provided with the tape drive brake driving device according to the first or third aspect. In this configuration, by maintaining the pressing force of the sliding portion against the capstan at an appropriate value, the slow reproduction of the tape deck is optimized, and at the same time, the gap between the first protrusion and the cam groove or the first cam is adjusted. Strong engagement increases the robustness of the tape deck.

[0018]

[Embodiment of the invention]

 Hereinafter, a tape deck provided with a brake drive device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a brake drive device provided on the rear surface of the chassis of the tape deck. The brake driving device 1 includes a worm 2, a cam wheel 3 (rotary body), and a capstan brake arm 6 (capstan brake member).

The worm 2 is mounted on the rear surface of the chassis S while being supported by the worm case 24, and is driven by a motor (not shown) via a pulley 21 provided at one end to rotate the cam wheel 3. Drive. The cam wheel 3 is rotatably supported by the rear surface of the chassis S, is rotated by a driving force applied by the worm 2, and drives a mode switching lever (not shown) by a pinion 31 to operate the apparatus. Switch the operation mode.

FIG. 2 shows the cam wheel 3. The cam wheel 3 includes a worm wheel 32 that receives drive from the worm 2, a cam groove 34 (first cam) that swings the boss 61 of the capstan braking arm 6, and a cam wall 37 that guides the boss 63. (Second cam) and a pinion 31 for driving the above-mentioned mode switching lever, which are integrally formed by resin molding. The cam wall portion 37 is formed on the outer peripheral side of the cam groove 34 over a section corresponding to the tape unloading state. The cam groove 34 has a large diameter portion for guiding the boss 61 to the outer peripheral side of the cam wheel 3 in a section corresponding to the slow reproduction mode and the rewind slow reproduction mode (hereinafter collectively referred to as the slow reproduction mode). 34a.

FIG. 3 shows the capstan brake arm 6. The capstan brake arm 6 swings in conjunction with the rotation of the cam wheel 3, and applies a brake to the rotation of the capstan flywheel 10 to perform slow reproduction in the slow reproduction mode. The capstan braking arm 6 has an arm body 63, a resin spring 64 extending from the arm body 63, and a boss 61 provided on the tip end 64 a of the resin spring 64 and engaging with the cam groove 34. I have. The arm body 63 is provided with a brake shoe 62 (sliding portion) that slides on the flywheel 10 to brake the capstan, and a boss 65 that contacts the cam wall 37. The capstan brake arm 6 is rotatably mounted at a predetermined position on the rear surface of the chassis S by a shaft 67 passing through the mounting hole 66. The flywheel 10 is supported at a predetermined position on the rear surface of the chassis together with the pulley 12, and transmits the rotational force applied to the pulley 12 from the capstan motor (not shown) via the belt 11 to the capstan. At the same time, the rotational speed of the capstan is smoothed by the moment of inertia to achieve stable tape running.

In FIG. 1, (a) shows the operation of the brake driving device 1 in the slow regeneration mode, and (b) shows an AA cross-sectional view thereof. In this state, the boss 61 is guided by the large-diameter portion 34a of the cam groove 34, rotates the arm body 63 in the direction C, and slides the brake shoe 62 provided on the arm body 63 to the flywheel 10. , Mechanically braking the capstan rotation. At this time, the resin spring 64 bends in a direction in which the tip end 64a approaches the arm body 63, thereby optimizing the pressing force of the brake shoe 62 against the flywheel 10 and performing appropriate capstan braking.

FIG. 4A shows the operation of the brake driving device 1 in a tape unloading state, and FIG. 4B shows a cross-sectional view taken along the line BB. In this state, since the boss 61 is engaged with the cam groove 34, it is locked in the radial direction of the cam wheel 3. On the other hand, the boss 65 abuts on the cam wall 37 and urges the arm body 63 in the C direction. As a result, the resin spring 64 is deformed in a direction in which the tip end 64a is relatively dissociated from the arm body 63. As described above, by providing two bosses on the capstan braking arm and using them separately by the cam curve (cam groove and cam wall), the bending deformation of the resin spring 64 in the slow regeneration mode is prevented. Be corrected. Therefore, even if the tape deck is abused under various adverse conditions, such as being left in the slow playback mode in a high temperature environment, it is possible to avoid permanent deformation of the resin spring due to "slack". Noise generated in the reproduced image can be reduced.

In the same state, the arm body 63 is urged in the outer peripheral direction of the cam wheel 3 in addition to the engagement between the boss 61 and the cam groove 34, so that the engagement between the boss 61 and the cam groove 34 is possible. Is made firmly. Therefore, even when the tape deck is transported, the boss 61 and the cam groove 34 are less likely to be disengaged by an impact such as dropping or vibration, and the robustness of the tape deck can be improved. In order to obtain these effects, it is sufficient to add the cam wall portion 37 to the cam wheel 103 and the boss 65 to the capstan braking arm 106 with respect to the conventional brake driving device 100. Since no special design is required, the above-described effects can be obtained at substantially the same cost as that of the conventional brake driving device. When the tape is loaded, the cam wheel 3 rotates in the direction D from the state shown in FIG. 4A and shifts to a stop (standby) mode or the like.

The present invention can be variously modified without being limited to the configuration of the above-described embodiment. For example, a spring that bends in order to optimize the pressing force of the brake shoe 62 on the flywheel 10 includes: The present invention is not limited to the resin spring 64, but may be an elastic spring made of another elastic body as well as a metal spring. Further, the shape is not limited to the shape shown in FIG. 3 and may be any shape having an equivalent function. Further, the capstan braking arm 6 is not limited to a structure that rotates about the shaft 66, and may be, for example, a rod-shaped form that slides in the horizontal direction. Furthermore, the cam for guiding the boss 61 and the boss 65 is not limited to the cam groove 34 and the cam wall 37, and may be a cam having the same function. The shape of the cam is not limited to the shape shown in FIG. 2, but may be any shape as long as the relative movements of the boss 61 and the boss 65 guided by the two cams are equivalent. Further, the engaging portion provided on the capstan braking arm 6 preferably has a projection shape like the boss 61 and the boss 65, but is not limited to this as long as it has a shape engaging with the cam. Instead, for example, a hole for engagement may be used.

[0026]

[Effect of the invention]

 As described above, according to the invention of claim 1, the deformation of the resin spring is corrected with the guidance of the second protrusion by the cam wall during tape unloading, and the slow playback mode in a high-temperature environment is achieved. Even under unfavorable conditions such as standing in a state, permanent deformation of the resin spring due to "set" can be avoided. As a result, the pressing force of the sliding portion against the capstan is appropriately maintained, the braking of the capstan is optimized, the slack of the tape in the slow reproduction mode is eliminated, and the generation of noise in the reproduced image is suppressed. Further, since the engagement between the first protrusion and the cam groove in the tape unloading state is firmly performed, even if an impact such as a drop or vibration is applied to the tape deck during transportation of the tape deck, the first protrusion may be applied. The possibility that the protrusion of the tape deck is disengaged from the cam groove is reduced, and the robustness of the tape deck can be improved.

According to the invention of claim 2, the deformation of the elastic spring is corrected with the guidance of the second projection by the second cam at the time of tape unloading, and the throw in the high-temperature environment is corrected. Even under unfavorable conditions such as being left in the playback mode, permanent deformation of the elastic spring due to “set” can be avoided. As a result, the pressing force of the sliding portion against the capstan is appropriately maintained, the braking of the capstan is optimized, the slack of the tape in the slow reproduction mode is removed, and the generation of noise in the reproduced image is suppressed. In addition, since the engagement between the first projection and the first cam in the tape unloading state is made firm, even if an impact such as a drop or vibration is applied to the tape deck during transportation of the tape deck, The possibility that the engagement between the first protrusion and the first cam is released is reduced, and the robustness of the tape deck can be enhanced.

According to the invention of claim 3, a tape deck having substantially the same cost as the conventional brake driving device, little noise in slow reproduction images, and high robustness against dropping and vibration during transportation. Can be manufactured.

According to the invention of claim 4, a tape deck that has little noise in slow reproduction images and is robust against dropping and vibration during transportation even under abuse under bad conditions such as high temperature. Can be.

[Brief description of the drawings]

FIG. 1 is a rear view of a chassis in a slow reproduction mode of a tape deck having a brake driving device according to an embodiment of the present invention and a cross-sectional view taken along line AA of FIG.

FIG. 2 is a rear view of a cam wheel used in the apparatus.

FIG. 3 is a rear view of a capstan brake arm used in the apparatus.

FIG. 4 is a rear view of the chassis in a tape unloading state of the deck and a cross-sectional view taken along the line BB.

FIG. 5 is a rear view of a chassis in a slow reproduction mode of a tape deck having a conventional brake driving device.

FIG. 6 is a rear view of a cam wheel used in the apparatus.

FIG. 7 is a rear view of a capstan braking arm used in the apparatus.

[Explanation of symbols]

Reference Signs List 1 brake driving device 3 cam wheel (rotating body) 6 capstan braking arm (capstan braking member) 34 cam groove (first cam) 37 cam wall portion (second cam) 61 boss (first projection) 62 Brake shoe (sliding portion) 63 Arm body 64 Resin spring (elastic spring) 65 Boss (second protrusion)

Claims (4)

[Utility model registration claims] 1. A rotating body which is driven to rotate when an operation mode of a tape deck is switched, and which slides on a capstan by swinging in conjunction with the rotation of the rotating body to brake the rotation. A capstan braking arm made of a resin molding material having a portion, wherein the rotating body is provided with a cam groove for swingingly driving the capstan braking arm, and the capstan braking arm includes A resin spring extending from an arm body having a sliding portion is provided, and further, a first protrusion engaged with the cam groove is provided on a distal end side of the resin spring. The portion is guided by the cam groove with the rotation of the rotating body, at least in the slow reproduction mode,
A tape deck brake driving device for oscillatingly driving the capstan brake arm in the outer circumferential direction of the rotating body and braking the rotation of the capstan while bending the resin spring accordingly, wherein the capstan brake arm The arm body is provided with a second protrusion, and the rotating body is provided with a cam wall that contacts the second protrusion. When the tape is unloaded, the first protrusion is provided. When the second projection abuts on the cam wall while the portion is locked in the radial direction of the rotating body by the cam groove, the arm body of the capstan braking arm is moved in the outer circumferential direction of the rotating body. Wherein the guide is adapted to correct the deflection of the resin spring. 2. A rotating body which is driven to rotate when an operation mode of the tape deck is switched, and a cap which slides on a capstan to brake the rotation by swinging in conjunction with the rotation of the rotating body. A first cam for swingingly driving the capstan braking member is provided on the rotating body, and the capstan braking member is provided with a first cam via an elastic spring portion. A first protrusion that engages with the cam of the first member; and the first protrusion is configured to rotate with the rotation of the rotating body.
The brake of the tape deck, which is guided by the cam of at least in the slow reproduction mode, and drives the capstan braking member to swing in a predetermined direction, thereby deforming the spring portion and braking the rotation of the capstan. In the driving device, the capstan braking member is provided with a second protrusion, and the rotating body is provided with a second cam that can contact the second protrusion, and at least a tape In the unloading state, while the first protrusion is locked in a predetermined direction by the first cam, the second protrusion comes into contact with the second cam, so that the capstan braking member Is guided to correct the deformation of the elastic spring portion. 3. The tape drive brake driving device according to claim 2, wherein the capstan braking member and the elastic spring portion are integrally formed by resin molding. 4. A tape deck comprising the tape deck brake drive device according to claim 1.